Transcription of Variable Frequency Oscillators (VFOs)
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Variable Frequency Oscillators (VFOs)
1. Chapter 10, Harris CRYSTAL SETS TO SIDEBAND. Frank W. Harris 2010, REV 12. Chapter 10. Variable Frequency Oscillators (VFOs). Sooner or later you'll become frustrated with being stuck on a few crystal-controlled frequencies. You would like to have a Frequency -tuning knob that covers the entire band and not just a few kilohertz. This sounds simple, but isn't. It's difficult because, without the stability of a crystal, an ordinary RF oscillator will drift hundreds of hertz while you're sending. The fellow you're talking to probably has a modern transceiver with a narrow, stable passband.
JFETs were explained and used in the VFO oscillator in the direct conversion receiver in chapter 7. ... right until you have studied this entire chapter and formulated a plan for your VFO. As you will see later, C2, C3 and C4 are part of the temperature compensation strategy and will need to be ... Simply protecting the VFO from air currents
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